Re: Readahead - is 128KB the limit ?

[shailesh jain <coolworldofshail@xxxxxxxxx>]

I get requests of 32pages.. i want to know if i can tweak dat param at VFS layer..

On Fri, Sep 25, 2009 at 12:52 AM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:

On Fri, Sep 25, 2009 at 9:35 AM, shailesh jain
<coolworldofshail@xxxxxxxxx> wrote:
> Hi,
>   Is the maximum limit of readahead 128KB ? ..  Can it be changed by FS
> kernel module ?

Hi Shailesh,

I am not sure about the size , but I think it is 64K. I think this is
because of the iovec structure which is an array of 16. So for a FS
(which are typically of blocksize 4K) this comes as 64K.


>
>
> Shailesh Jain
>



--
Thanks -
Manish